• 🇬🇧 Oganesson
  • 🇺🇦 Унуноктій
  • 🇨🇳 not available
  • 🇳🇱 Oganesson
  • 🇫🇷 Oganesson
  • 🇩🇪 Oganesson
  • 🇮🇱 
  • 🇮🇹 Oganessio
  • 🇯🇵 ウンウンオクチウム
  • 🇵🇹 Oganessio
  • 🇪🇸 Oganessio
  • 🇸🇪 Oganesson
  • 🇷🇺 Унуноктий

Oganesson atoms have 118 electrons and the shell structure is

The ground state electron configuration of ground state gaseous neutral oganesson is  [Rn].5f14.6d10.7s2.7p6 (a guess based upon that of radon) and the term symbol is  1S0 (a guess based upon guessed electronic structure).

Kossel shell structure of oganesson
Schematic electronic configuration of oganesson.
Kossel shell structure of oganesson
The Kossel shell structure of oganesson.

Atomic spectrum


A representation of the atomic spectrum of oganesson.

Ionisation Energies and electron affinity

The electron affinity of oganesson is (no data) kJ mol‑1. The ionisation energies of oganesson are given below.

Ionisation energies of oganesson
Ionisation energy number Enthalpy / kJ mol‑1
Ionisation energies of oganesson
Ionisation energies of oganesson.

Effective Nuclear Charges

The following are "Clementi-Raimondi" effective nuclear charges, Zeff. Follow the hyperlinks for more details and for graphs in various formats.

Effective nuclear charges for oganesson
1s(no data)  
2s(no data) 2p(no data)  
3s(no data) 3p(no data) 3d(no data)  
4s(no data) 4p(no data) 4d(no data) 4f(no data)
5s(no data) 5p(no data) 5d(no data)  
6s(no data) 6p(no data)  


These effective nuclear charges, Zeff, are adapted from the following references:

  1. E. Clementi and D.L.Raimondi, J. Chem. Phys. 1963, 38, 2686.
  2. E. Clementi, D.L.Raimondi, and W.P. Reinhardt, J. Chem. Phys. 1967, 47, 1300.

Electron binding energies

Electron binding energies for oganesson. All values of electron binding energies are given in eV. The binding energies are quoted relative to the vacuum level for rare gases and H2, N2, O2, F2, and Cl2 molecules; relative to the Fermi level for metals; and relative to the top of the valence band for semiconductors.
Label Orbital eV [literature reference]


I am grateful to Gwyn Williams (Jefferson Laboratory, Virginia, USA) who provided the electron binding energy data. The data are adapted from references 1-3. They are tabulated elsewhere on the WWW (reference 4) and in paper form (reference 5).


  1. J. A. Bearden and A. F. Burr, "Reevaluation of X-Ray Atomic Energy Levels," Rev. Mod. Phys., 1967, 39, 125.
  2. M. Cardona and L. Ley, Eds., Photoemission in Solids I: General Principles (Springer-Verlag, Berlin) with additional corrections, 1978.
  3. Gwyn Williams WWW table of values
  4. D.R. Lide, (Ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 81st edition, 2000.
  5. J. C. Fuggle and N. Mårtensson, "Core-Level Binding Energies in Metals," J. Electron Spectrosc. Relat. Phenom., 1980, 21, 275.